This thesis begins with the hypothesis that the concentration in the purchase of green coffee by multinationals contributes to force down the price of the coffee beans paid to Brazilian and Colombian scattered producers. It was divided into four parts. Parts I and II comprise its theoretical basis: Part I deals with the theory of dependence and Part II analyzes contemporary theories of international relations. Part III, in turn, brings a panorama of the international green coffee market, while Part IV, conclusive, rescues the strategies of trade and defense of the two greatest organizations of coffee producers from Brazil and Colombia, the Cooxupé and the FNC, respectively. The Part IV still analyzes aspects of the global green coffee market that can be explained by the discussed theories, evaluates that there is a greater concentration of gains in the oligopsonistic multinationals market, which confirms the hypothesis, but despite that, there is no dissatisfaction with the activity on the part of the producers. At last, the conclusion shows that in spite of the differences which are present in the coffee production in Brazil and Colombia, the practices of the FNC and Cooxupé are very similar.

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